Texas Instruments Tiva TM4C123GH6PM User Manual

Analog Comparator
4 Analog Comparator
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.1 Introduction
The comparator API provides a set of functions for dealing with the analog comparators. A com-
parator can compare a test voltage against individual external reference voltage, a shared single
external reference voltage, or a shared internal reference voltage. It can provide its output to a
device pin, acting as a replacement for an analog comparator on the board, or it can be used to
signal the application via interrupts or triggers to the ADC to cause it to start capturing a sample
sequence. The interrupt generation and ADC triggering logic is separate, so that an interrupt can
be generated on a rising edge and the ADC triggered on a falling edge (for example).
4.2 Functions
Functions
void ROM_ComparatorConfigure (uint32_t ui32Base, uint32_t ui32Comp, uint32_t ui32Config)
void ROM_ComparatorIntClear (uint32_t ui32Base, uint32_t ui32Comp)
void ROM_ComparatorIntDisable (uint32_t ui32Base, uint32_t ui32Comp)
void ROM_ComparatorIntEnable (uint32_t ui32Base, uint32_t ui32Comp)
bool ROM_ComparatorIntStatus (uint32_t ui32Base, uint32_t ui32Comp, bool bMasked)
void ROM_ComparatorRefSet (uint32_t ui32Base, uint32_t ui32Ref)
bool ROM_ComparatorValueGet (uint32_t ui32Base, uint32_t ui32Comp)
4.2.1 Function Documentation
4.2.1.1 ROM_ComparatorConfigure
Configures a comparator.
Prototype:
void
ROM_ComparatorConfigure(uint32_t ui32Base,
uint32_t ui32Comp,
uint32_t ui32Config)
ROM Location:
ROM_APITABLE is an array of pointers located at 0x0100.0010.
ROM_COMPARATORTABLE is an array of pointers located at ROM_APITABLE[6].
ROM_ComparatorConfigure is a function pointer located at ROM_COMPARATORTABLE[1].
April 8, 2013 29

Texas Instruments Tiva TM4C123GH6PM Specifications

General

Core	ARM Cortex-M4F
Clock Speed	80 MHz
Flash Memory	256 KB
SRAM	32 KB
GPIO Pins	43
UART	8
I2C	2
SPI/SSI	4
USB	USB 2.0
Timers	6
Communication Interfaces	UART, I2C, SPI, USB
Operating Temperature	-40°C to 85°C
Package	LQFP64

Summary

Boot Loader

Introduction

Explains the ROM-based boot loader and its interfaces for flash updates.

Serial Interfaces

Details the UART, SSI, and I2C interfaces used by the boot loader.

USB Interface

Describes the USB boot loader functionality using the DFU protocol.

Controller Area Network (CAN)

Flash

GPIO

Hibernation Module

Inter-Integrated Circuit (I2C)

Interrupt Controller (NVIC)

Memory Protection Unit (MPU)

Pulse Width Modulator (PWM)

Synchronous Serial Interface (SSI)

System Control

Timer

UART

uDMA Controller

USB Controller

Using USB with the uDMA Controller

Watchdog Timer

Introduction

Functions

Lists and describes API functions for watchdog timer configuration, interrupts, and lock mechanism.